The Dow Chemical Company

Joel G Courtwright

Edwin R Henson

Tipton T Masterson

David J Leggett

Metal chelates in solution are decomposed more effectively and completely by ozonation when magnesium hydroxide is added to the chelate solution prior to ozonation. The process is particularly applicable to waste streams from which it is desired to recover metals to avoid contamination of the environment and/or reuse them.

Recovery of metals from solutions containing chelants

The corrosion of metals in contact with corrosive fluids is effectively inhibited by the addition of one or more phenyloxazoles, preferably 2,5-diphenyloxazole.

Use of phenyloxazoles as corrosion inhibitors

This invention relates to a corrosion inhibiting composition for ferrous metals and its alloys in gas conditioning service using aqueous monoethanolamine to scrub carbon dioxide containing oxygen. The corrosion inhibiting composition includes a thiourea-amine-formaldehyde based polymer and, in the preferred embodiment, also includes a cupric ion producing material.

Corrosion inhibitors for alkanolamines

This invention relates to a corrosion inhibiting composition for ferrous metals and its alloys in gas conditioning service using aqueous monoethanolamine to scrub carbon dioxide. The corrosion inhibiting composition includes a thiourea-amine-formaldehyde based polymer and, in the preferred embodiment, also includes a nickel ion producing material.

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Angleton, TX, United States of America

Joel G Courtwright